Been a long time since I've logged in here, but I'm running a 3600 rpm diesel setup at 11kw. I use it for whole house backup. With central air, I guzzle slightly less than a gallon an hour in summer heat. Without that load on, I can use as little as 1 gallon in four hours give or take. I have gas heat, water, stove, and dryer to give you perspective. Hope that helps.